var el=document.getElementById("<?php echo $_GET['el'] ?>"),
  p="<?php echo(isset($_GET['p'])?$_GET['p']:'') ?>",
  w=p.split(';'),wc=w.length,wi,wdef;
  
el.label=(wc>0?w[0]:'');
el.valueTrue=(wc>1?w[1]:'');
el.valueFalse=(wc>2?w[2]:'');
el.innerHTML=el.label+"\
<input type=\"checkbox\"/>\
";
//onclick=\"alert();\"
//this.value=(this.checked?this.true:this.false);
//alert(el.id+")))"+el.label+el.valueTrue+el.valueFalse);

<?php
?>
